Omnigraph: Rich Representation and Graph Kernel Learning
11 Pages Posted: 2 Mar 2020
Date Written: October 10, 2015
OmniGraph, a novel representation to support a range of NLP classification tasks, integrates lexical items, syntactic dependencies and frame semantic parses into graphs. Feature engineering is folded into the learning through convolution graph kernel learning to explore different extents of the graph. A high-dimensional space of features includes individual nodes to complex networks. In experiments on a text-forecasting problem that predicts stock price change from news for company mentions, OmniGraph beats several benchmarks based on bag-of-words, syntactic dependencies, and semantic trees. The highly expressive features OmniGraph discovers provide insights into the semantics across distinct market sectors. To demonstrate the method’s generality, we also report its high performance results on a fine-grained sentiment corpus.
Keywords: machine learning, natural language processing, sentiment analysis, artificial intelligence, financial forecasting, asset pricing, computational finance, quantitative finance, stock price prediction, equity market, financial news
JEL Classification: C53, C55, C63, G11, G12, G14
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